My $.02 may not be worth anything, but there are some good suggestions above. I've owned high end AR's, low end and have built a plethora of them over the years. I have some experience in their usage. If one shops around, one can find a decent AR to fulfill a wide range of scenarios. I've posted my S&W M&P15OR in a few threads now and will share it again here. I picked it up for $450 and I think it was a police trade in. Didn't look to have ever been fired. There was no wear marks that I could find after getting it home and disassembling it. I of course, did upgrade some external parts to suite my fancy. This rifle will probably out last me the way I shoot and will definitely cover any situation I might find myself in. YMMV. OP, I wish you the best in your journey and hope it is a positive learning experience.
When I got it...

As it looks now...


When I got it...

As it looks now...
